Improvement in preventing incrustations in steam-boilers



A. P. DOEN & J. C. G. MILLER. Preventing Inorustation in Steam-Boilers.

No. 213,498. Patented Mar. 25,1879.

Fig.1.

|T SS S; I IN NT FKSJ hiyez MPETERS, PHOTDJJTHOGRAPNER. WASHINGTON u cUNITED STATES PATENT QFFIOE.

ALEXANDER P. DOEN AND JOHN O. C. MILLER, OF EVANSVILLE, INDIANA.

IMPROVEMENT lN PREVENTING lNCRUSTATlONS lN STEAM-BOILERS.

Specification forming part of Letters Patent No. 213,498, dated March25, 1879; application filed July 16, 1878.

To all whom it may concern:

Be it known that we, ALEXANDER P. DoEN and JOHN G. CALHOUN MILLER, ofEvansville, Indiana, have invented a new and use ful Improvement forPreventing Inornstations in Steam-Boilers, of which the following is aspecification, reference being had to the accompanying drawings, forminga part thereof.

The object of our invention is to prevent the formation of incrustationsand sediment inside of boilers on the bottom part of their shells; andit consists of a screen formed of wire-cloth with open meshes, or of apiece of sheet metal perforated with holes, and stretched horizontallythe entire length and width of the boiler under the fiues and above thebottom of the boiler, where incrustations and sediment are the mosttroublesome and dangerous. This screen may be provided with a trap-dooror other suitable opening near the broom-hole in the boiler, throughwhich the scales can be taken out when desirable.

Figure 1 is an end view of a transverse section of the shell of a boilerhaving our screen. Fig. 2 is a view of our screen exposed by tearingaway a part of the upper portion of the shell of the boiler.

A is the shell of the boiler; B, the fines; O, the Wires around thefines, and twisted together underneath, and the strands then separated,stretched in opposite directions in a line passing across the boiler,and then attached to the screen. The screen hangs from the fines bythese wires. The wire screen is stretched upon the frame F, which bearsupon and against the sides of the boiler. E is the mud-drum; D, thescreen; G, the waterline; H, the trap-door.

During the time that the engine is in motion the scales andincrustations form wholly about the fines, and in the ordinary boiler assoon as the engine stops they settle to the bottom and remain there,forming the hard cake or crust, which is the cause of boilers burningout at the bottom immediately over the fire.

By means of our improvement the screen underneath the fiues catches thisfalling sediment, and prevents it from reaching the bottom of theboiler, which, in consequence, is kept clean and free from incrustationand scales.

We claim as our invention- The wire screen D, stretched upon the frameF, suspended from the fines by the wires 0, and resting against and uponthe shell of the boiler under the fines, all constructed and arranged asshown, and for the purpose specifled.

In testimony whereof we have signed our names to this specification inthe presence of two subscribing witnesses.

ALEXANDER P. DoEN. JOHN o. oALHoUN MILLER.

WVitnesses:

THOMAS ScANTLIN, OHAs. F. MARTIN.

